The transmission medium is connected to the phone device note panel red rice recovery, and between mobile devices provides the physical channel information transmission. Is the actual carrier of information transmission. Essentially, the signal transmission cable phone and wireless phone are electromagnetic waves propagation in different media, in the process of decision on the use of the electromagnetic spectrum information transmission capacity phone process fundamentally. Theoretically oppo phone panel recycling, any signal frequencies can be used as a mobile phone, but in fact, we are still based on the factors business requirements, propagation characteristics to selectively use electromagnetic spectrum. This chapter describes the twisted pair, coaxial cable, optical fiber, cable and other common cable transmission technology. Wireless media: radio media in use can be divided into visible light, microwaves, ultraviolet, infrared and other bands. Although there is some bands can be used without authorization, but most wireless bands are required after authorization or even later can be used. For example, in the third generation mobile phone network construction 0 ago, many network operators spent billions of dollars to buy a license to operate a mobile phone backgammon panel recycling, that is to buy the right to use the respective bands, and eventually these costs are to be borne by the user. Fiber: Fiber is also a wired medium, which can provide up to terahertz level of bandwidth, and the error rate is very low, but the disadvantage is the installation complex and require specialized personnel and specialized equipment. 0 ago, mainly used in fiber optic backbone network. Table 2'1 gives a different use of the electromagnetic spectrum of mobile phone technology, as well as the electromagnetic spectrum corresponding to different transmission media and typical applications BBK mobile phone panel recycle recycling _ _ Jiangsu panel Obo Obo electronic is supplied by Shenzhen Electronic Technology Co., Ltd. Shenzhen City Aobo Electronic Technology Co. (www.aobodz.com) strong, credible, in other industries in Shenzhen, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Obo electronics into the brilliant and you work for a better future!